Unnamed (north of lower Chathenda Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold; pyrite

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale A-2
Latitude 62.0819
Longitude -141.8933
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 4,700 feet on the north valley wall of lower Chathenda Creek. It is 3,000 feet northwest of Bonanza and 3,500 feet southeast of the summit of hill 5940. The site is in the NW1/4 of section 35, T. 4 N., R. 19 E., of the Copper River Meridian. This is locality 40 of Richter and others (1975) and may be included in National Park Service locality WRST-60 or WRST-61 (unpublished data). Cobb and Richter (1980) included this prospect under the name 'Chathenda Cr.'. It is located to within a few hundred feet.

Geologic setting

Geologic description

At this prospect, gold-bearing quartz-pyrite veins locally cut iron-oxide-stained altered zones in volcanic breccia of the Cretaceous, Chisana Formation (Richter and Matson, 1970 [OFR 70-275]; Richter and Jones, 1973; Richter and others, 1975). The volcanic rocks are intruded by the mid-Cretaceous, Chisana pluton about 4,000 feet northwest of the prospect. The Chisana pluton varies from clinopyroxene diorite to monzonite and has a K/Ar date of 110 +/- 3.0 Ma (Richter, Lanphere, and Matson, 1975).
Geologic map unit (-141.895429107713, 62.0815360317364)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Mid-Cretaceous? The deposit may be related to emplacement of the Chisana pluton which has a K/Ar date of 110 +/- 3.0 Ma (Richter, Lanphere, and Matson, 1975).
Alteration of deposit Pyrite and quartz veining and replacement(?). Oxidation has produced abundant iron-staining.

Production and reserves

Workings or exploration A number of small gold-bearing quartz-pyrite lodes occur in mineralized volcanic country rock of the Cretaceous, Chisana Formation on the north side of Chathenda Creek (also see NB080 and NB092). By 1940 a large group of claims had been staked in this area but exploration, including trenches and some short adits, was unsuccessful.
Indication of production None

Additional comments

The prospect is in the Wrangell-St. Elias National Preserve.

References